The correct answer is ransomware, specifically file-encrypting ransomware that demands payment for recovery. This is because the combination of unopenable files with strange extensions and a ransom note on the desktop are classic ransomware symptoms identification markers; the malware uses a symmetric encryption algorithm like AES-256 to lock the files, then leaves a note demanding cryptocurrency in exchange for the decryption key. On the Security+ SY0-701 exam, this scenario tests your ability to distinguish ransomware from other malware types like a Trojan or a worm—a common trap is confusing it with a virus that corrupts files, but ransomware’s defining feature is the ransom demand. Remember the mnemonic “FEN” for File extensions, Encrypted, Note: if you see all three, think ransomware.
SY0-701 Threats, Vulnerabilities, and Mitigations Practice Question
This SY0-701 practice question tests your understanding of threats, vulnerabilities, and mitigations. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A help desk technician receives a call from a user who says many of their documents now have strange file extensions and a ransom note appeared on the desktop. The files will not open. What type of malware is the user most likely experiencing?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Ransomware that encrypts files and demands payment for recovery
The user's symptoms—unopenable files with strange extensions and a ransom note—are classic indicators of ransomware. Ransomware encrypts files using a symmetric key (e.g., AES-256) and then demands payment, typically in cryptocurrency, to provide the decryption key. This matches the scenario exactly, as the files are rendered inaccessible and a note is left behind.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Spyware that silently records user activity over time
Why it's wrong here
Spyware usually watches or steals information without immediately locking files or demanding payment.
✓
Ransomware that encrypts files and demands payment for recovery
Why this is correct
Ransomware commonly encrypts a victim's files and displays a demand for payment to restore access.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
A worm that spreads mainly by scanning for other hosts
Why it's wrong here
Worms focus on self-replication and spreading, not typically encrypting local files for extortion.
✗
A rootkit that hides malicious processes from the operating system
Why it's wrong here
Rootkits are designed to hide presence and maintain stealth, not usually to lock files for ransom.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse ransomware with a worm because both can spread rapidly, but the key differentiator is the encryption of files and the presence of a ransom demand, which is unique to ransomware.
Detailed technical explanation
How to think about this question
Modern ransomware often uses a hybrid encryption model: a fast symmetric cipher (like AES-256) encrypts the files, and the symmetric key is then encrypted with an asymmetric public key (e.g., RSA-2048) so only the attacker's private key can decrypt it. The ransom note typically includes a unique victim ID and instructions for payment via Tor browser to a cryptocurrency wallet, making attribution difficult.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A developer is choosing between AES-256 (symmetric) and RSA-2048 (asymmetric) for encrypting a large file that will be sent to a partner. Symmetric encryption is fast but requires key exchange; asymmetric is slower but solves the key distribution problem. A hybrid approach — encrypt the file with AES, encrypt the AES key with RSA — is standard. Questions like this test whether you understand when each approach applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this SY0-701 question in full detail.
Threats, Vulnerabilities, and Mitigations — This question tests Threats, Vulnerabilities, and Mitigations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Ransomware that encrypts files and demands payment for recovery — The user's symptoms—unopenable files with strange extensions and a ransom note—are classic indicators of ransomware. Ransomware encrypts files using a symmetric key (e.g., AES-256) and then demands payment, typically in cryptocurrency, to provide the decryption key. This matches the scenario exactly, as the files are rendered inaccessible and a note is left behind.
What should I do if I get this SY0-701 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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